Suggest Cure For Swelling In The Ankle

I was running down the stairs, missed the last few, and fell on my ankle wrong. When I fell I think I hurt my ankle make a sound and I felt what was like a tearing under my skin. I can barely walk up and down the stairs and when I do walk on it, it hurts... I tried putting a shoe on but the pressure from that hurts also, and every time I sit down for a bit and get back up it hurts even worse. My ankle is swollen and there is another lump in the area, also I can see a hit of some redness. I am 19 years old 5 foot 2 inches and about 135 lbs what should I do? Also I have not gone to the doctor yet...